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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bad81cb577dce6ca37cc70686a349817de521b2bf700a083acb1afcab3a3087' 
  AND token = 'hI6VcLEFaS5YWQqAn2sGpEiaixsFKwOe/zpWrbRYJrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}